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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c391800e2eae0335e4a377b58a2bb440ed26254cd9eac33993b4648c4c70f0b' 
  AND token = 'JanFKnCbsJhnr6QLLMss8b00AkBb+spdEZ+Xaq3avpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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