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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af34fe5f304963d043c0b9ddf4cb6a847989aa9de529d16fdfb05a4fe464caa8' 
  AND token = 'XZ9DGwU+czMjteaJ1OfEUTWq09qaQB4cHlTraIREOuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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