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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e822e08740978e5a0ae0a4ef50e3105af963736ff4b3bae8165eb8c1551ce71' 
  AND token = 'wS388AwuqGrqKnVYSwWor9VQTsq2xtGYTSHJXNaAC0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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