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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63734c028577488f87e62687c7ff02664ae68a585831b5a155b365cdf50ef4e0' 
  AND token = 'SZO5gZ3UeOP1KlqVxlErb0J7QYE/5ham3TJecKfWTPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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