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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc56f0e1927816bd09a59a4fa6845d0225f21d30a25bfb0f8290852312f9aef' 
  AND token = 'xBpCGia22WHJgWge2uDIRxYZP5Sd+0i84M2HSRLvi/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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