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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195826aa8369db1d6f73ff8e34e626953e3612532aca37a3c826d81b7c84c6eb' 
  AND token = 'oTJbDyEahfd6aVJou4imILhl+EGtB8ArKKmPiTEw6fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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