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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9923115f7868de665686253f2997d0c872d1476ff4e81c18bfcfca493f7e0353' 
  AND token = '3aBwvBMSgfFqYMX11d2l18b4HrUsPmjp82fc4bIBI7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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