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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f133be971918495639132285c7e83e9e883f88840c8c678f0ac9672a8c9e67' 
  AND token = 'L3mUUvNbzMXNhSebI7GWibTW/Xx9LhTauw0mAtUeS9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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