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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb599136416207b32a2f4ca551e17094415857957e9ef2fe6fec00d0885a5f90' 
  AND token = 's3oD0e9O8JVoEy0xOvCKrEZZmA8PTQFbVoqAp4dRACY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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