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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cc1be6940d65f880f80c20b1724753c8523be4f3a6b305fe2041fa71a94a25' 
  AND token = '5eIQdlzDnaDHWAbJydP7g7mvX04qz0CvqAQ+wA+75jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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