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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ef8cd8426c662f719464337b71e31233b11bb7b0add0d59e3795d265328582' 
  AND token = 'S5q+Ohips9JX7W3TvCS6Mu6ury+5BWy3Cj63gyst6m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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