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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e670f77ab62db9fba649ae7a9d7a6dec148551d5c09c28515c51f9dd68eac1d' 
  AND token = '9AQ2aB5aCg3hcJRi8T3dgjUxryFADBMKhkHgv+ff4Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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