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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891cf06b93722cca9b3640d1cbaa7ffb67e0a92d4c9aeaada7fa33bb0d8893fb' 
  AND token = 'O0e607z5QMya8YdIlecQe7Cl9EwoI1MEAfAdr5KbE9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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