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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8455afda4ab9c902b36c096ffec1b7a6b6ed14bed097e3686e9ca722678343' 
  AND token = 'ZxrTEzbOAVjBC5cQgrHRgAgz15HdULuoCU9M2u2a21o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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