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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85273ea056085de402e2353a39c321eb8ea3cce871f2229bc633f4ada92576b' 
  AND token = 'iROKBcn/bOHNcwZCoDiIwUACMIVtTS6FUwwqTDwbvwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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