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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf6932cc024b66e898e4efc2e213a84c083ad7514f1163ae5d0f676047e1652' 
  AND token = 'iWgtS5MHo9asKkzrKVoRN7SiE6TIlYFr3MkAO5iTgC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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