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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dcc34991f8039b6d9d09f2f484341ca0b7647ec77beba199f88dfb6d0a998e' 
  AND token = 'neXlvqlihsoWWGOH1y/f7ZiVBHq6FU6qUAU6kverOh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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