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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f2b5d52e14b8c8da0dfc9290cb095c8183d400ca20069abc0de89ce4590acf' 
  AND token = 'LdlL5j/CRnfqw3kH1p2A/QNB2/inSA+2fU2hIF14aos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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