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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3056abf66030989493a2e7426be86c24c38ce806bd4b7b05fb018b298cf5799' 
  AND token = 's3Zda4bSqhmHfb501V8uVW0jJKg98F4emy+6yP8yWnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}