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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647808cb30002ea716f969c71d865b6a3bcb16ce61fe28b27b99fac02913dfca' 
  AND token = 'EbT5fbLa3sorHcX0QykV7spJFhYAoJR7RwA/rVgsFeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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