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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74ab284fbcae6cbad5d4a26956ede9191878b3bf8076b16503dc40cc0a532aa' 
  AND token = 'ElvLtvnvvCeh9D8mjSXnIC9E1zQHuFTgP0I18BzXRY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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