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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69165aad5437a2979d14c9d1cd1f0031355a82bb61bed7a0333ad656f4a6357f' 
  AND token = 'PY8ETgwDo7x1cRcJONWJAAArfZ9SIwfMviZlA9gdauc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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