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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43cc5f769ec74384ad73d050a4c959c83ef7c3d931252a5ef1100e866eec1680' 
  AND token = 'R7dT31fUNsPR0Ja2YjmFteYRvI1up9KSV6CGBmsFttA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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