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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e67edfd7382cd3f396577f88d3fc5465e407cf65d7f2e6f75aed3b725b85bfb' 
  AND token = 'z+J+zw6gv26w6e+TtXk7ZdSS7DCYEUiaCHB18L/er0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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