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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524c5fd335647a7d1e2b358aa7cd70d399e0039ce02d2be14cdc7a21217ffcde' 
  AND token = 's0wISnUsch+wO3Jz9Py46E3fcC17XDYyqJgWjWO6cVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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