SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2070167123db551ed84a3ecb70166c5900e689c44c086575e8d94ecbf779d10f' 
  AND token = '+jYA+Qzh+iqMNNxZ29sjSULyKamYNonea7/tVpBZ2ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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