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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5ef4bf0dbf497f8c5bc78e3d03c31ac19baa6f59b33d0cc327fc685023b1c3' 
  AND token = 'WD2KbbQzFa4iW548biHtoV94GoFJujbbNl4IqpNvzts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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