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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f2eca80526f8f7f3fe2ca3876c7dd4bf255da08f7725312c9c2e2accd2361a' 
  AND token = '3kzzBABn98HT7jaSs/CmztDxTrurb+ljn4KFo0lm15o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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