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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb9e88f65102ff9847670b5d55b6b59c1026af0f6ddc0a6a00587c2e6364eb9' 
  AND token = 'CURoKXiRPmaGqRSKGTNdDBPvE8235HCSwDBFXc7MJA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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