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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f832fd101d2469c3839e7ffaa845f34efbfa5ba8a9a74fcaa79f6ccc71bc6e5' 
  AND token = 'lS+StKWfCTry9up/IEQ1s2ysPdrLDgeRIKycdtKEe7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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