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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9894fc60735e29646d42171a10b2a4ec374ee331a9fbf46a7dce6536f88e5210' 
  AND token = 'NmbNHSannj8arnMGEopphS9oTaWhRK2/5XGv8UpTTmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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