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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ab08940a182437b979c458f53575033cb8d1dcc2ed881edc1c8060f0160277' 
  AND token = 'JD57rLiQc+YmY0dJGKW4Lh7fGyG2xDT9Kx8woiwTKM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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