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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da21b77ae7114daf5d5cbac8a8973ac9484a670c113a0b51cbd7fd51a8c4f8c8' 
  AND token = 'TB+1Mkza5mbFtOe6RaqJUVVXfYunyZD3wkiidn9FRBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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