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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c537938fdf56d4feda5111e82d99963fb6bb1b5769b56da697a09af61f53c392' 
  AND token = 'wlofa5Xk26C4PfSgNhiaC4cs1bgzJ+zhONTrb0ChIxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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