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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244d0aff73a53c37997023ad711ce3247807e9f8e9f179225ab4fda9b29193ee' 
  AND token = 'dOIB2iKTH+9gmu33IQK5MBR3r9qghM9COXaBoBEkD7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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