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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30240b4117eb94495224814f1950e133eb126883d7a0705592232fc3458501ee' 
  AND token = '6cYZNVwPX0NDUDHFYiJPwuLZGecEmmQhd3e01y/IO6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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