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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1c638b68cfd9c13d1bafe8efe1f5fd77d9245f7e63ae19008fb34aed6a725f' 
  AND token = 'FLVBu2mDrkeAqW1z25Q+XdJk/92ygoLpWkVSWS/9yYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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