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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1931b5f02ae23eead7212ee9dda72fdf03eac4b3dfbc2f1ee7a79c8476da43' 
  AND token = 'nGu/lQWnKrxii5RR7OaJG9JoqV4kyVlsbhiBQCKtLyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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