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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb5bd3c04b5d4515a9cb49af01a7adf780e4add891a060310edf7af72a7d119' 
  AND token = 'mvrfazV5McR2VnsXxM5mJ2zsTZgim/+y0Vtl3W93WcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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