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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a7a478d0b75c96a769adbf9fc56d78f092ef87e734076cd6ddc758f71d5ede' 
  AND token = 'Ef23+glhitU02TPyG5BsJYHL9UGOox21GDw1Bz463fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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