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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55776601113747ad3d71ba4b50649f1214b0a5855cd53b6df7694c846367885a' 
  AND token = 'uHAWog8f7Fqs9AMPZk8E9Hanqj2/kxTs0aBBO1HjwSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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