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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0295322e8885b8e50dcba95930968e8cc7f4a6cebd98ebc616df173b80eee79' 
  AND token = 'dCKV2h17YDaH4M3ARmJimIBU4g1gt/Sk2/RP4+lDZ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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