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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e764e08b82d0cad3e4caa55d163c3253857bdb9ee358048648a14c198662a1' 
  AND token = '1Z6UJupXGter5cZrd/yWcL56LhltT/5n+my06CHQVyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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