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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e6a6e97c89d2ca0f30ca67cebf1ca09a361661673ecaf78a4dc42bd6f64a20' 
  AND token = 'mE/KMiwrGxsKsre6nI1Iu+c5sQ2jyiNSufWROAJUCug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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