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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdf9f0784488caa24f860ccaf2b9213ae587ee7c0589aa2511c4554bb6572ce' 
  AND token = 'XDYuQ5/8sr1dpWicnpOc3Tl90st42s7VDSc7+Pu+NoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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