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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4844bffa7812cc2e5d7afe761d6e5ed6cf5ce2c419635166fb40ac59d2179c7b' 
  AND token = 'P0JQHffrMhWnqPDY0IlzVMNSfhfnt5eI3ctpDNCboWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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