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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da05925431030ba0680b2d38c88b6dd1d1591809f8fdf06b67044bcc94e03d4' 
  AND token = 'rBkpgUWHJJQYdDu+mYUwsLRkk1YEy9/DvGcmF18r+gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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