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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05087f3a394ace5fb04ac22579a00592a15572fe2b3eff37f6f89f6c302fd9c' 
  AND token = 'dvTBRrBnBXV998qzrshmca88K/UEqcnSQh8yUNgnL/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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