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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc154fb798f48748aa193c21131925dbf1c853c845956b521d996eafe9f5c6f' 
  AND token = 'E8A+iolcMyXa+LuYENjTaVjxF9NW2Uu2IMjN5dqf4FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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