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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5e908a459455cf2156a3efea126634bb60a79a139625bf51b9b1d01ce4955e' 
  AND token = 'CduzyU9s+Xa6ookus+q1R7zFW/Bms9lcU+eqVWDAtQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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