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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c11bda281ed8f62145f7ac6f4751adfad54b3fbc4c06361c99bfa9eec25108d' 
  AND token = '3aScdw103TbJOGllgWG1XD0FOJAGzOJF4O7g2HZVi8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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