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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0534f3a8699a3678c9cd56a0b12a51a030586fa48da0a9d21cbf892e7fdfe0f' 
  AND token = 'Z3caIX/9nSNihG1dLn9Eth+bD8eeruu7tuoryo8GJLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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