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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eec3d07bc8a6939c9d1856723713ebc4037b52e9fb14f259fd9857627fa486b' 
  AND token = '7mcEoX+R+ZCQ+UyO3/byYh84KEivEfaGfmJxh8EOP7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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