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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89ca413076ba34f497d74868436eec691b19d33a6b09fb22f1c8108d005e821' 
  AND token = 'FkhU72/5bw6lNLXIuLRDxTUAeFm0vBHorqd4jyFKI6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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