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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb6af6a5676930a3f098115ec7ef588ad295c79919236bd0e1f8e1c7bb7a6b7' 
  AND token = 'Nwhhincf/d5Z1aGhweQRf+0EQM/xxbrgAwvNQEuwYl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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