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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d26c5cf90b71c23349c89cb131117d44b7e0407a4769a5257f41c14589c37a0' 
  AND token = '6RL7hiHx+H7TnI1fKpOE+e9EpivPWhoKb+EJqlTR8jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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