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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc32ef6eb9a12b370e9219964ad2ca152ba3c5ea0e599582638b7f1929c256a9' 
  AND token = 'RYS3DzlxyoRYKhOR6S/jfok3z+7ChpDHAj1Lk66zcuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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