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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcd12f4cab4619ea92b89f0f40c8065bb9aa06ec3e07a4c5ebd17c4a526e47d' 
  AND token = 'DrDKa+OMFjtbtg7UZsj0xOz3qCQ3BaANOjABO60iEEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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